Bore gauge head



March 25, 1952 w. J. BRYANT ET AL BORE GAUGE HEAD 2 SHEETSSHEET l INVENTORS WILLlAM J. BRYANT HESSLAR H. GATES lHOR H. LJUNGGREN W FMMY ATTYS Filed July 25. 1949 2 SHEETS-SHEET 2 INVENTORS WILLIAM .J. BRYANT HESSLAR 'H. GATES LHQR H. LJUNGGREN I ATTYS W. J. BRYANT ET AL BORE GAUGE HEAD March 25, 1952 Filed July 25, 1949 I 1 4 R i 5 J 4 -m mp Won A @N g 7 g mi N? 3 2 Patented Mar. 25, 1952 BORE GAUGE HEAD William J. Bryant, Springfield, Vt., Hesslar H.

Gates, Charlestown, N. H., and Thor H. Ljunggren,

Springfield, Vt., assignors to Bryant Chucking Grinder Company, Springfield, Vt., a corporation of Vermont Application July 23, 1949, Serial No. 106,476

Claims. '1

This invention relates to sizing mechanism and is more particularly concerned with internal sizing.

One object of the invention is to provide a sizing mechanism of the compressed air type, which is adjustable for size indication without changing the air escape aperture.

A further object is to provide such a sizing mechanism for use in an internal grinding machine to periodically test the size of the hole as it is increased during the grinding operation.

Still another object of the invention is to provide a sizing mechanism wherein the gaging portions are protected from access by coolant and detritus from the grinding operation.

Further objects and advantages will appear from a description of an embodiment of the invention shown in the accompanying drawings in which Figure 1 is a fragmentary view partly in side elevation and partly in section of the work-carrying spindle and related parts including a grinding wheel of an internal grinding machine and showing a sizing gage embodying the invention in gaging relation to a work piece and with the grinding wheel retracted.

Figure 2 is a diagrammatic view mainly in longitudinal section, of the air gage system.

Figure 3 is a view similar to a portion of Figure 1, but to a larger scale and showing the gage retracted from the work and the grinding wheel at its inner limit of traverse.

Figures 4 and 5 are views similar to Figure 3, but showing the gage and grinding wheel in different relative positions, Figure 5 showing the hole in the work piece at approximately finished size.

Figure 6 is a longitudinal sectional view through the gaging head and related parts to a larger scale.

Figure '1 is a right hand end elevation of the parts shown in Figure 6.

Figure 8 is a fragmentary view similar to a portion of Figure 6, but with gaging parts in different positions.

Figures 9 and 10 are detail sectional views on lines 9-9 and Iii-Ill, respectively, of Figure 6.

The sizing mechanism of this invention is illustrated herein as applied to an internal grinding machine of the type illustrated in the Bryant et a1. application for Letters Patent, Serial No.

29,996 filed May 29, 1948, for Internal Grinding Machine with Automatic Gage Sizing now Patent No. 2,585,533.

Referring to Figure 1, at l is indicated a portion of the grinding machine having a spindle head 2 thereon which rotatably carries a Work spindle 3. On the forward end of this work spindle is a suitable chuck 4 having a plurality of jaws 5 arranged to hold a work piece 6 pressed back against a suitable stop I and in centered relation to the axis of the spindle 3. This chuck per se forms no part of the present invention but forms subject matter of the Ljunggren and Green application Serial No. 740,642 filed April 10, 1947, for Combination Diaphragm and Clamp Chuck now Patent No. 2,473,380.

The rear end of the spindle 3 is provided with suitable means, such as a pulley ID, by which it may be rotated. At II is shown a portion of a wheel head from which projects a grinding wheel spindle I2 at the outer end of which is carried a grinding wheel I3 arranged to grind the internal surface of the work piece 6. The work spindle 3 is hollow and has extended therethrough a sleeve l5 provided with a flanged head l6 which at suitable times may contact with the rear face of the work piece 6 as shown in Figures 1, 4, 5, and 6, and slidable through this sleeve ['5 is the gaging mechanism to which this invention is more particularly directed.

As shown best in Figures 6 and 8, this gage mechanism comprises a tubular member 20 cut away at its forward or outer end through a portion of its periphery, leaving an arcuate portion 2| (see particularly Figure 7). provided on its outer face with a pair of spaced relatively stationary work-engaging anvils 22, which, when the hole within the work piece 6 is near to finished size, may pass thereinto and engage at spaced points on its inner circumferential surface as shown in this figure. Extending through this tubular member 20 is a stem 25 and substantially in the transverse plane of the anvils 22, this stem 25 is provided with an adjustable and relatively movable gaging anvil 26. As shown this anvil 26 has a threaded shank portion 21 threaded laterally through the stem 25 and adapted to be fixed in axially adjusted position by means of a lock nut 28 having a conical base 29 fitting a conical seat 30 in the stem25. As shown the stem 25 may be formed in two parts, an inner portion 3| carrying an outwardly'extending threaded stud 32 and an outer portion 33 adapted to engage the stud. This provides means for securing the inner margin of a circular diaphragm 35 to the stem 25, being clamped between collars 36 and 31 which are held together by the engagement of the outer element 33 of the stem against the outer face of the collar 31. This construction also permits angular adjustment of the anvil 26 so that it is positioned substantailly equally spaced angularly from the anvils 22, as shown in Figure 7 by broken lines. The outer margin of the diaphragm 35 is clamped between a pair of rings 38 and 39 seated in a counterbored portion 43 of the tubular member 20 and held in place by an externally threaded ring 4| engaging an internally threaded portion 42 of the member 25. This diaphragm 35 provides a hinge connection between the stem 25 and the tubular member which allows the anvils to accommodate themselves to the size of the opening in the work within which they are engaged. At the same time the diaphragm seals off the outer end of the gaging mechanism where the anvils are positioned from that portion to the rear of the diaphragm where size responsive mechanism is positioned, preventing the passage of coolant and detritus from the grinding operation past the diaphragm and into contact with the responsive mechanism.

However, it is important that the pivotal mo tion of the stem be limited to a plane transverse to a line joining the relatively stationary anvils 22 or a plane passing through the stem-carried anvil 2B and the axis of the tubular member 23, but a diaphragm of itself does not provide for this limited pivotal action. For thi reason a leaf spring 45 is shown secured as by screws 66 to the rear end of the stem 25 in a suitable recess 41 therein, this spring being secured at its other end as by screws 48 against a shoulder 39 in the tubular member 28. In order to afford access to the screws 48, the tubular member 29 may be provided with a hole 50 therethrough opposite to the screws 48 which may be normally closed as by a plug 5 I.

To further limit the flexure to relatively short portions of the leaf spring and to prevent twisting, its central portions may be stiifened as by reinforcing plates 52 secured to opposite sides and held in position by rivets, or the like, 5-3, while single reinforcing plates 5% may be employed at the securing screws 46 and t8.

One of the elements of the sizing mechanism, as, for example, the tubular member 2?, may be provided with an air passage E0 extending there through which opens laterally through a surface 6| thereof through an aperture at 62 which is close to a surface 63 on the stem 25, the closeness of these two surfaces depending upon the angular position of the stem 25 with reference to the member 20, which, in turn, is determined by the spacing of the anvils.

The sleeve [5, as shown, is provided with a slot 65 therethrough within which is positioned a leaf spring 66 secured at one end to the member at as by the screw 6?, the curved end portion of the spring 66 bearing against a portion 69 of the work spindle. This spring 66 presses the outer end of the member 20 laterally so as to hold the anvils 22 against the internal surface of the work piece 6 when the anvils are within the work or against the inner counterbored portion iii of the sleeve i5 when the anvils are retracted from the work, the movable anvil 26 then taking a position, depending upon the size of the hole either in the work piece or in the sleeve [5, and determining the spacing between the apertured surface 6! and the surface 63 of the stem.

vThe air passage til communicates at its rear end through a swivel with a passage '55 which is connected through a pipe H (see Figure 2) with the indicating mechanism 18 of an air gage as shown in Figure 2. This air gage is of well known type comprising a vertical tapered transparent tube 19 having an indicating bob 86 supported therein by a column of air which is derived from a suitable source of compressed air through suitable control valves SI and $2. The tapered tube 19, the taper of which is shown much exaggerated in Figure 2, provides a graduated column within which the bob 80 is supported by the current of air at a height dependent upon the rate of discharge of the air through the aperture 62, this, in turn, being dependent upon the spacing between the movable anvil 25 and the stationary anvils 22. Suitable mechanism responsive to the position of the bob 80, as shown in the Bryant et al. application Serial No. 29,996 hereinbefore noted, may be provided for automatically controlling the cycle of operations of the machine in accordance with the position of the bob, but as this forms no part of the present invention it is not herein further disclosed.

As is also shown in the same Bryant et al. application, means may be provided for reciprocating the grinding wheel to bring it into or out of the work piece and to traverse the work piece when in contact therewith, and in time therewith. The gaging mechanism which rotates with the work spindle may be moved axially so that when the wheel is retracted, the gaging mechanism may enter the work if it be of sufiiciently large size and when the wheel has entered the work, the gaging mechanism may be retracted. This may be done by suitable mechanism including a bell crank lever having an arm 85 engaging a sleeve 87 journaled on the rear end of a tubular member 88 threaded into and forming a rear extension of the member 29, a spring 89 normally tending to press the member 20 into the work, this member 20 being periodicall retracted therefrom by suitable mechanism as hereinbefore noted and into the position shown in Figure 3.

The tubular members 20 and 83 form a unit extending through the hollow work spindle the bore of which is of slightly larger diameter than the outside of the unit, which is supported at its rear end in the sleeve 87 and there held so as to be moved axially by motion of this sleeve 87. This unit is further supported radially by a narrow land 880 (Figure 1) allowing for a slight rocking or bending at the front or gaging end where a bias is imposed by the spring 66. At 88f. the unit is keyed to the spindel so as to be rotated .therewith. The sleeve 15 is normall held against the rear face of the work as by a light spring 90 reacting between its head It and a portion 9| of the chuck in the position shown in Figures 1, 4 and 5. A shoulder 92 of the tubular member 253 engaging a mating shoulder 93 of the sleeve I5 acts to retract the sleeve #5 when the member 28 is retracted suhiciently, the internal bore of the sleeve l5 adjacent to its outer end being near to and less than the desired finished size of the work but not exactly this size, so that when the gaging anvils ride thereon, the bob 88 will be somewhat out of and below the position corresponding to the desired size of the work piece. By making the internal size of this sleeve somewhere near the finished size of the work, the bob remains sufficiently close to finished size indication so that it is not moved violently thereto when finished size of the gage is reached and the gaging anvils enter the work as shown in Figure 5 and by its position below the light beam, the bob is prevented from passing across the light beam at other times than when the work piece has reached the desired size.

Air which escapes from the aperture 52 back of the diaphragm 35 escapes from the interior of the member 29 through the escape passages 95 into the internal bore of the sleeve [5 from which it may escape through the large passages 98 and 91, the slot 65, and also through the bore of the work piece, to the outer atmosphere.

As the grinding proceeds, the gaging anvils are moved periodically toward the work and when the work size is sufiiciently near to finished size, the anvils enter therein, as shown in Figure 5, and the bob 89 indicates on the graduated tube 19 the internal size of the work piece, and When either rough or finished size has been reached, automatic control of the grinding machine for the next cycle of operations may be initiated as is fully set forth in the Bryant et al. application Serial No. 29,996.

t will be noted, however, that at no time can coolant or detritus find its Way past the diaphragm into the sensitive portions of the mechanism, and that by the use of movable anvils adjusted to diiferent distances from the axis of the stem 25, holes of different diameters can be gaged with the same accuracy and with the same spacing of the faces SI and 63 for the same nearness to a desired work size.

From the foregoing description of an embodiment of this invention, it will be evident to those skilled in the art that various changes and modifications may be made therein without departing from its spirit or scope.

We claim:

1. A gaging mechanism comprising a tubular member for insertion within a hole to be gaged, and provided with a relatively fixed work-gaging anvil, a stem extending through said tubular member and having a gaging anvil for cooperation with said relatively fixed anvil for gaging internal work, a diaphragm arranged transversely of said member and hingedly connecting said member and stem together, a leaf spring connecting said member and stem and limiting the hinge motion between said member and stem to a single plane including the axis of said tubular member and the gaging anvil carried thereby, mechanism within said tubular member on the opposite side of said diaphragm from said anvils responsive to the spacing of said anvils, and indicating mechanism operatively connected to said responsive mechanism.

2. A gaging mechanism comprising a tubular member for insertion within a hole to be gaged and provided with a pair of angularly spaced work-engaging anvils, a stem extending through said tubular member and having a portion of substantially smaller diameter than the bore of said tubular member, a work engaging anvil carried by said stem for engagement with the work angularly spaced from said pair of anvils, a pivot connection between said said stem and member spaced from said anvils, said pivot connection including a diaphragm, and a leaf spring secured at opposite ends to said tubular member and stem on the opposite side of said diaphragm from said anvils and limiting the direction of fiexure of said stem at said diaphragm to a single plane substantially perpendicular to a line joining said pair of anvils.

3. A gaging mechanism comprising a tubular member for insertion within a hole to be ga and provided with a pair of angularly spaced work-engaging anvils, a stem extending through said tubular member and having a portion of substantially smaller diameter than the bore of said tubular member, a work-engaging anvil carried by said stem for engagement with the work angularly spaced from said pair of anvils, a pivot connection between said stem and member spaced from said anvils, said pivot connection including a diaphragm, a leaf spring secured at opposite ends to said tubular member and stem on the opposite side of said diaphragm from said anvils and limiting the direction of flexure of said stem at said diaphragm to a single plane substantially perpendicular to a line joining said pair of anvils, and means for stiffening the central portion of said spring localizing the bending thereof due to the pivotal motion of said stem to positions adjacent to the securcment of the ends of said spring.

4. A gaging mechanism.comprising a tubular member for insertion within'a hole to be ga e and provided with a pair of angularly spaced work-engaging anvils, a stem extending through said tubular member and having a portion of substantially smaller diameter than the bore of said tubular member, a work-engaging anvil carried by said stem for engagement with the work ang-ularly spaced from said pair of anvils, and a pivot connection between said stem and member spaced from said anvils, said pivot connection including a diaphragm and a leaf spring secured at opposite ends to said tubular member and stem on the opposite side of said diaphragm from said anvils and limiting the direction of fiexure of said stem at said diaphragm to a single plane containing said stem-carried anvil and the axis of said tubular member.

5. A gaging mechanism comprising a tubular member for insertion within a hole to be gaged and provided with a pair of angularly spaced work-engaging anvils, a stem extending through said tubular member and having a portion of substantially smaller diameter than the bore of said tubular member, a work-engaging anvil carried by said stem for engagement with the work angularly spaced from said pair of anvils, and a pivot connection between said stem and member spaced from said anvils, said pivot connection including a diaphragm and a. leaf spring secured at opposite ends to said tubular member and stem on the opposite side of said diaphragm from said anvils and limiting the direction of fiexure of said stem at said diaphragm to a single plane containing said stem-carried anvil and the axis of said tubular member, and means for stiffening the central portion of said spring localizing the bending thereof due to the pivotal motion of said stem to positions adjacent to the securement of the ends of said spring.

WILLIAM J. BRYANT. HESSLAR H. GATES. THOR I-I. LJUNGGREN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,497,574 McDonough June 10, 1924 1,518,790 I-Iech et al Dec. 9, 1924 34,302 Conradson et a1. Apr. 21, 1925 1,985,576 Mennesson Dec. 25, 1934 2,004,361 Arms et a1 June 11, 1935 2,160,378 Balsiger May 30, 1939 2,239,981 Terry et a1. Apr. 29, 1941 2,349,526 Sunner May 23, 1944 2,374,154 Moore Apr. 17, 1945 2,397,494 Kuppersmith A Apr. 2, 1946 2,439,595 Cooke Apr. 13, 1948 6 Rupley Mar. 28, 1950 FOREIGN PATENTS Number Country Date 606,434 Great Britain Aug. 13, 1948 

